#778 Portable driver error with Linux/Mono

[David Rossiter]

Portable running under Linux Mint/Mono. All required packages are installed. Fujitsu fi-6130 sheet fed scanner. This scanner is supported by SANE.
Paper source = Glass produces no image
Paper source = Feeder or Duplex results in error upon selecting Scan: An error occured with the scanning driver.

Details with the Duplex setting:
NAPS2.Scan.Exceptions.ScanDriverUnknownException: An error occurred with the scanning driver. ---> System.NullReferenceException: Object reference not set to an instance of an object
at NAPS2.Scan.Sane.SaneOptionParser.Parse (System.IO.StreamReader streamReader) [0x000bb] in <30917c5e8a264d469b3bab5ea75463d7>:0
at NAPS2.Scan.Sane.SaneWrapper.GetOptions (System.String deviceId) [0x00021] in <30917c5e8a264d469b3bab5ea75463d7>:0
at NAPS2.Scan.Sane.SaneScanDriver+<>c__DisplayClass13_0.<getoptions>b__0 () [0x0001b] in <30917c5e8a264d469b3bab5ea75463d7>:0
at NAPS2.Util.CollectionExtensions.GetOrSet[TKey,TValue] (System.Collections.Generic.Dictionary2[TKey,TValue] dict, TKey key, System.Func1[TResult] defaultValue) [0x00009] in <30917c5e8a264d469b3bab5ea75463d7>:0
at NAPS2.Scan.Sane.SaneScanDriver.GetOptions () [0x0001e] in <30917c5e8a264d469b3bab5ea75463d7>:0
at System.Lazy1[T].ViaFactory (System.Threading.LazyThreadSafetyMode mode) [0x00049] in <12b418a7818c4ca0893feeaaf67f1e7f>:0 at System.Lazy1[T].ExecutionAndPublication (System.LazyHelper executionAndPublication, System.Boolean useDefaultConstructor) [0x00030] in <12b418a7818c4ca0893feeaaf67f1e7f>:0
at System.Lazy1[T].CreateValue () [0x0008c] in <12b418a7818c4ca0893feeaaf67f1e7f>:0 at System.Lazy1[T].get_Value () [0x00018] in <12b418a7818c4ca0893feeaaf67f1e7f>:0
at NAPS2.Scan.Sane.SaneScanDriver+<>c__DisplayClass14_1.<transfer>b__1 () [0x00025] in <30917c5e8a264d469b3bab5ea75463d7>:0
at NAPS2.WinForms.FScanProgress+<<fscanprogress_shown>b__32_0>d.MoveNext () [0x00023] in <30917c5e8a264d469b3bab5ea75463d7>:0
at Microsoft.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) [0x00042] in <1c7d529d87ec4bdcbde02e9494f3b5ae>:0
at Microsoft.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccess (System.Threading.Tasks.Task task) [0x0001c] in <1c7d529d87ec4bdcbde02e9494f3b5ae>:0
at Microsoft.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) [0x00009] in <1c7d529d87ec4bdcbde02e9494f3b5ae>:0
at Microsoft.Runtime.CompilerServices.TaskAwaiter.GetResult () [0x00000] in <1c7d529d87ec4bdcbde02e9494f3b5ae>:0
at NAPS2.Scan.ScanDriverBase+<>c__DisplayClass30_0+<<scan>b__0>d.MoveNext () [0x00073] in <30917c5e8a264d469b3bab5ea75463d7>:0
--- End of inner exception stack trace ---
at Microsoft.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) [0x00042] in <1c7d529d87ec4bdcbde02e9494f3b5ae>:0
at Microsoft.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccess (System.Threading.Tasks.Task task) [0x0001c] in <1c7d529d87ec4bdcbde02e9494f3b5ae>:0
at Microsoft.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) [0x00009] in <1c7d529d87ec4bdcbde02e9494f3b5ae>:0
at Microsoft.Runtime.CompilerServices.TaskAwaiter.GetResult () [0x00000] in <1c7d529d87ec4bdcbde02e9494f3b5ae>:0
at NAPS2.Scan.ScanPerformer+<performscan>d__7.MoveNext () [0x00483] in <30917c5e8a264d469b3bab5ea75463d7>:0 </performscan></scan></fscanprogress_shown></transfer></getoptions>

[Maarten Boekhold]

See the following 2 tickets that cover these same 2 reported issues:

• https://sourceforge.net/p/naps2/tickets/773/
• https://sourceforge.net/p/naps2/tickets/775/